Crossword Genius

Legally land aquatic reptile losing leg (5)

Ross

I believe the answer is:

terra

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'legally land' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for terra that I've seen before include "Legally land" , "Centre" , "-- Firma; -- incognita" , "Land (Latin)" , "Dry land" .)

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